The Verizon and Sprint models contain both GSM and CDMA antenna hardware. If you have a CDMA device, you can get it carrier-unlocked (search the web, costs $20-30) and then activate it on another CDMA carrier, or insert an active SIM from a GSM carrier.

The GSM versions of the HTC One (AT&T, T-Mobile, International, Developer, Google Play Edition, etc) only have GSM antenna hardware. They physically do not contain the CDMA antenna. So these devices would only work on other GSM networks if carrier-unlocked.

So with your HTC One Developer Edition, it only contains GSM antenna hardware, you cannot use it on CDMA networks.

There are posts floating around suggesting to flash a different radio to "enable CDMA", but I'll tell you that flashing software cannot magically make a physical piece of hardware appear in your device.

Most of the GSM radio drivers are cross-compatible (an international radio driver will still work with AT&T and vice-versa). But the Verizon and Sprint models use specific radios for those networks.

The Verizon and Sprint models contain both GSM and CDMA antenna hardware. If you have a CDMA device, you can get it carrier-unlocked (search the web, costs $20-30) and then activate it on another GSM carrier, or insert an active SIM from a GSM carrier.

The GSM versions of the HTC One (AT&T, T-Mobile, International, Developer, Google Play Edition, etc) only have GSM antenna hardware. They physically do not contain the CDMA antenna. So these devices would only work on other GSM networks if carrier-unlocked.

So with your HTC One Developer Edition, it only contains GSM antenna hardware, you cannot use it on CDMA networks.

There are posts floating around suggesting to flash a different radio to "enable CDMA", but I'll tell you that flashing software cannot magically make a physical piece of hardware appear in your device.

Most of the GSM radio drivers are cross-compatible (an international radio driver will still work with AT&T and vice-versa). But the Verizon and Sprint models use specific radios for those networks.

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